SIZE
COMMON DRIVE
1. PHILLIPS (PH)
2. SLOTTED/ SLOT
3. PHILLIPS/ SLOTTED COMBO.
4. HEX EXTERNAL
5. HEX SOCKET
6. QUADREX
7. TORX (TX)
MORE DETAILS REGARDING 「DRIVE」, PLEASE CHECK ON https://en.wikipedia.org/wiki/List_of_screw_drives
COMMON SHAPE OF HEAD
1. WELD STUD
2. TRUSS HEAD
3. PAN HEAD
4. PAN WASHER HEAD
5. HEX FLANGE HEAD
6. FLAT (COUNTERSUNK) HEAD
7. OVAL HEAD
8. ROUND HEAD
9. BUGLE HEAD (Used for High Low Scr.)
10. CUP HEAD (Used For Carriage Bolt)
HARDNESS
